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Biology · 2024 · 2 marks
CBSE 2024 · Region 3 · Set 1 · Q18
What is a vaccine? Write the basis on which it acts when administered in the body.
What is a vaccine ? Write the basis on which it acts when administered in the body.
Marking-scheme solution
• Vaccine is a preparation of antigenic proteins of pathogen or inactivated/weakened
pathogen.
• It is based on the property of memory of immune system, the antibodies produced
in the body in response to these antigens would neutralize the pathogenic agents and body will show amnestic or quick response
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CBSE Class 12 Biology past-paper question from the 2024 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.